Transcription of POWER SUPPLY DESIGN BASICS - STMicroelectronics
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POWER SUPPLY DESIGN BASICS - STMicroelectronics
APPLICATION NOTEAN253/1088 POWER SUPPLY DESIGN BASICSby P. ANTONIAZZIIn mains-supplied electronic systems the AC inputvoltage must be converted into a DC voltage with theright value and degree of 1 and 2 show the simplest rectifier these basic configurations the peak voltageacross the load is equal to the peak value of the ACvoltage supplied by the transformer s secondarywinding. For most applications the output ripple pro-duced by these circuits is too high. However, forsome applications - driving small motors or lamps,for example - they are a filter capacitor is added after the rectifier diodesthe output voltage waveform is improved consider-ably. Figures 3 and 4 show two classic circuits com-monly used to obtain continuous voltages startingfrom an alternating voltage. The Figure 3 circuit usesa center-tapped transformer with two rectifier diodeswhile the Figure 4 circuit uses a simple transformerand four rectifier 1 : Basic Half Wave Rectifier 2 :Full Wave Rectifier Wich uses a Cen-ter-tapped 3 :Full Wave Rectified Output From theTransformer/rectifier Combination is fil-tered by 4 :This Circuit Performs Identically to thatShown in Figure 5 shows the continuous voltage curve obtai-ned by adding a filter capacitor to the Figure 1 section b-c is a straight line.
POWER SUPPLY DESIGN BASICS by P. ANTONIAZZI In mains-supplied electronic systems the AC input votlage must be converted ni to a DC voltage wthi the right value and degree of stabilization. Figures 1 and 2 show the simplest rectifier circuits. In these basic configurations the peak voltage across the load is equal to the peak value of the AC
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